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Smelting process for efficient slagging and desulfurization of LF aluminum killed steel

An aluminum-killed steel and slag-making technology, applied in the field of smelting, can solve the problems of difficult control of calcium metal addition, unstable desulfurization, and increased production costs

Active Publication Date: 2021-02-05
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, calcium metal is a relatively active element. It is difficult to control the addition of calcium metal after the converter is tapped so that it will not be oxidized, resulting in unstable desulfurization in the production process and increasing production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]This embodiment is a smelting method for LF aluminum killed steel with high efficiency slagging and desulfurization in the process path of "300t converter→argon blowing station→RH→continuous casting". The steel type is SPHC, and the specific steps are as follows:

[0033] (1) Converter steelmaking: 53.2 tons of steel scrap into the furnace, 272 tons of hot metal into the furnace; the end temperature of converter blowing is 1624 ° C, the end point of oxygen is 546 ppm; the bottom blowing intensity is increased in the later stage of converter blowing, and the stirring of the molten pool is strengthened;

[0034] (2) In the steel tapping process, the infrared slag detection is used, and the slag blocking cone + pneumatic slag blocking are used to strictly control the amount of slag falling in the converter; when 1 / 5 of the steel is tapped, the alloy and auxiliary materials are added through the rotating trough, and the rotating trough is dynamically adjusted during the adding...

Embodiment 2

[0043] This embodiment is a smelting method for LF aluminum killed steel with high efficiency slagging and desulfurization in the process path of "300t converter→argon blowing station→RH→continuous casting". The steel type is SPHC, and the specific steps are as follows:

[0044] (1) Converter steelmaking: 60.8 tons of steel scrap into the furnace, 267 tons of hot metal into the furnace; the end temperature of converter blowing is 1656 ° C, the end point of oxygen is 471ppm; the bottom blowing intensity is increased in the later stage of converter blowing, and the stirring of the molten pool is strengthened;

[0045] (2) In the steel tapping process, the infrared slag detection is used, and the slag blocking cone + pneumatic slag blocking are used to strictly control the amount of slag falling in the converter; when 1 / 5 of the steel is tapped, the alloy and auxiliary materials are added through the rotating trough, and the rotating trough is dynamically adjusted during the adding...

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Abstract

The invention discloses a smelting process for efficient slagging and desulfurization of LF aluminum killed steel. The smelting process for efficient slagging and desulfurization of the LF aluminum killed steel comprises the following steps that S1, converter steelmaking is carried out, and the end point temperature of a converter is controlled within 1610-1660 DEG C; the adding amount of scrap steel is less than or equal to 70 tons; and a strong bottom blowing mode is adopted in the later converter blowing stage to enhance molten pool stirring. According to the smelting process for efficientslagging and desulfurization of LF aluminum killed steel, converter tapping, argon blowing station and LF refining tasks are adjusted through process design to form a three-in-one refining process ofconverter tapping, argon blowing station and LF refining, LF slagging work is advanced, a rapid slagging process system is formulated, 80% or above of slagging slag materials are added in the tappingprocess through design optimization, and slag melting is promoted by fully utilizing tapping steel flow impact kinetic energy, molten steel sensible heat and ladle bottom argon blowing stirring kinetic conditions; an argon station adopts a top-bottom strong stirring proper deoxidation process, slag is rapidly formed to promote steel slag reaction, top slag reduction pre-desulfurization is realized, and LF slagging desulfurization burden is reduced; and an LF target is heated once to basically complete slagging and desulfurization tasks.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a smelting process for efficient slagging and desulfurization of LF aluminum killed steel. Background technique [0002] As an important smelting process, LF furnace refining is one of the main functions of slagging and desulfurization. Although it can meet the production requirements for steel grades below 20ppm sulfur, the refining process takes a long time and there is room for further improvement in desulfurization rate. The long refining cycle leads to the increase of power consumption, electrode consumption, argon gas consumption, and the decrease of the service life of ladle refractory materials. At the same time, it often leads to the occurrence of continuous casting casting speed drop and even broken pouring accidents due to node reasons. Frequent changes in casting speed are also It will have a great impact on the quality of the slab. Compared with converter smelting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C5/36C21C7/06
CPCC21C7/064C21C5/36C21C7/06Y02P10/20
Inventor 王泉黄传根毛鸣徐小伟沈广文周亚辉舒宏富乌琼胡晓光
Owner MAANSHAN IRON & STEEL CO LTD
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